Both those lines are polluted with uncertainties regarding the precise lineage of any given descendent.  Costa is not Old Catholic.  I would not risk my soul on either of these lines.

What uncertainties are there with the Old Roman Catholic Church or Duarte Costa lines? They both have maintained the valid form. The duarte costa group still uses the vernacular tridentine rite. also, I consider pretty much any independent "Catholic" sect that rejects church teaching on papal infallibility and other subjects to be old catholic.

The Old Catholic Church now 'ordains' women to the priesthood and to the episcopate. Those ordinations are invalid because women cannot be ordained validly to the priesthood.  

The line of Utrecht  in the United States was valid line. In France, it went off nut, not in America. At least prior to the '70s.

They also welcome gαys and lesbians while ordaining openly gαy men.

Take a look:

https://lgbtqreligiousarchives.org/collections/old-catholic-church

They may accept gαys and lesbians. However the 'ordination' of women to the priesthood is invalid. The 'consecration' of women to the episcopate is invalid. Any 'mass' of confession or anointing of the sick, offered by those women would be invalid. Any priest (man of woman) ordained by the Old Catholic woman bishop would be invalid and any sacraments offered by those 'priests' priestesses' would be invalid. 
It could also be possible that an official theology which admits openness to the ordination of women could also possibly be a cause for the invalidity of their sacraments.

They may accept gαys and lesbians. However the 'ordination' of women to the priesthood is invalid. The 'consecration' of women to the episcopate is invalid. Any 'mass' of confession or anointing of the sick, offered by those women would be invalid. Any priest (man of woman) ordained by the Old Catholic woman bishop would be invalid and any sacraments offered by those 'priests' priestesses' would be invalid.
It could also be possible that an official theology which admits openness to the ordination of women could also possibly be a cause for the invalidity of their sacraments.

Ordaining gαys or women invalidates the ordination because both ɧoɱosɛҳųαƖity and being female are  impediments to the reception of the sacrament.

What uncertainties are there with the Old Roman Catholic Church or Duarte Costa lines? They both have maintained the valid form. The duarte costa group still uses the vernacular tridentine rite. also, I consider pretty much any independent "Catholic" sect that rejects church teaching on papal infallibility and other subjects to be old catholic.

Please read what I wrote.  It’s not about the Rite per se.  It’s about the fact that most of these lines are now untraceable, filled with guys who had dubious or unsubstantiated “orders” from somewhere else.  You would be very hard pressed to find a docuмent trail all the way back.  It’s not uncommon in those groups for an alleged priest to show up and get consecrated without there having been any proof he was a priest.  It’s the same with a few of the Thuc lines.  So far only the des Laurier & Carmona lines remain reliable.